Rotary machine with axial stop incorporating a current generator

Abstract

The rotary machine comprises a rotary shaft ( 2 ) supported by first and second radial magnetic bearings ( 5, 6 ) that are electrically controlled by a control device ( 13 ), said rotary shaft being fitted with an axial abutment device ( 100 ) comprising a rotor formed by a disk ( 101 ) secured to the rotary shaft ( 2 ) and interposed between first and second stators ( 102, 104 ) formed annularly around the rotary shaft and each including at least one annular coil ( 103; 105 ) controlled electrically by a system for servo-controlling the axial position of the rotary shaft. The stator ( 104 ) of the axial abutment device ( 100 ) further comprises a secondary induction circuit ( 106 ), and the disk ( 101 ) secured to the rotary shaft comprises a primary induction circuit ( 107 ) so that during rotation of the shaft, electricity is excited in the secondary induction circuit in order to supply energy to the radial magnetic bearings.

1. A rotary machine comprising a rotary shaft ( 2 ) supported by first and second radial magnetic bearings ( 5 ,  6 ) that are electrically controlled by a control device ( 13 ), said rotary shaft being fitted with an axial abutment device ( 100 ) comprising a rotor formed by a disk ( 101 ) secured to the rotary shaft ( 2 ) and interposed between first and second stators ( 102 ,  104 ) formed annularly around the rotary shaft and each including at least one annular coil ( 103 ;  105 ) controlled electrically by a system for servo-controlling the axial position of the rotary shaft, characterized in that one of the two stators of the axial abutment device ( 100 ) further comprises a secondary induction circuit ( 106 ), and in that the disk ( 101 ) secured to the rotary shaft includes a primary induction circuit ( 107 ) so that during rotation of the shaft, electricity is excited in the secondary induction circuit so as to deliver energy to the radial magnetic bearings. 
   
   
     2. A rotary machine according to  claim 1 , characterized in that the primary induction circuit comprises a plurality of permanent magnets ( 208 ,  209 ;  308 ;  408 ) fixed in the structure of the disk ( 101 ). 
   
   
     3. A rotary machine according to  claim 2 , characterized in that the permanent magnets ( 308 ;  408 ) are disposed uniformly in the disk on a circle of diameter that is greater than, equal to, or less than the diameter of the secondary induction circuit. 
   
   
     4. A rotary machine according to  claim 2 , characterized in that the permanent magnets ( 208 ,  209 ) are disposed uniformly in the disk as a first series on a circle of diameter smaller than the diameter of the secondary induction circuit ( 206 ) and in a second series on a second circle of diameter greater than the diameter of the secondary induction circuit, such that the gap defined between the first and second series of magnets forms a housing ( 210 ) for the secondary induction circuit. 
   
   
     5. A rotary machine according to any one of  claims 1  to  4 , characterized in that the secondary induction circuit ( 206 ) comprises at least one toroidal winding ( 215 ) wound on a core ( 216 ) fixed to the stator ( 204 ) of the axial abutment device ( 200 ). 
   
   
     6. A rotary machine according to any one of  claims 1  to  4 , characterized in that the secondary induction circuit ( 306 ) comprises at least one plane winding ( 312 ) on a printed circuit disposed on an annular structure ( 314 ) fixed to the stator ( 304 ) of the axial abutment device ( 300 ). 
   
   
     7. A rotary machine according to  claim 6 , characterized in that the plane winding ( 312 ) is disposed on the face of the annular structure ( 314 ) which faces the nearer poles of the permanent magnets. 
   
   
     8. A rotary machine according to any one of  claims 1  to  7 , characterized in that the device ( 13 ) for controlling the radial magnetic bearings is connected to the secondary induction circuit in order to receive the electricity generated therein. 
   
   
     9. A rotary machine according to any one of  claims 1  to  8 , characterized in that the control device ( 13 ) is fixed to the machine and includes an explosion-proof cover ( 14 ). 
   
   
     10. A rotary machine according to any one of  claims 1  to  9 , characterized in that it operates in an explosive atmosphere zone ( 20 ). 
   
   
     11. A rotary machine according to any one of  claims 1  to  10 , characterized in that it does not have an electric motor integrated therein.